> My hunch is that social networks is essentially blogging + access control to
> posts using the social graph.
>
> Your wall is your feed reader.
> It can read posts it has access to given your position in a social network.
> You can make friends (ping back)
>
> Posting to a wall could be done in many ways: either pinging, or just
> posting the content.
This is very close to how I see it as well: http://activityweb.org/
Except for the access control bit. Blogs have been public by default.
The latest (draft) version of PubSubHubbub [1] has some support for
private feeds which looks promising.
1. https://superfeedr-misc.s3.amazonaws.com/pubsubhubbub-core-0.4.html#validationsub
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Sandeep Shetty